package controller;

import com.fasterxml.jackson.databind.ObjectMapper;
import model.Blog;
import model.BlogDao;
import model.User;
import model.UserDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/authorInfo")
public class AuthorServlet extends HttpServlet {
    private ObjectMapper objectMapper=new ObjectMapper();

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("application/json");
        // 通过这个方法, 来获取到指定的博客的作者信息
        String param=req.getParameter("blogId");
        if(param==null||"".equals(param)){
            //参数缺失
            resp.getWriter().write("{ \"ok\": false, \"reason\": \"要查询的博客不存在!\" }");
            return;
        }
        //根据blogId查找对应博客
        BlogDao blogDao=new BlogDao();
        Blog blog=blogDao.selectOne(Integer.parseInt(param));
        if(blog==null){
            resp.getWriter().write("{ \"ok\": false, \"reason\": \"要查询的博客不存在!\" }");
            return;
        }
        //根据博客的userId来查询作者
        UserDao userDao=new UserDao();
        User author=userDao.selectById(blog.getUserId());
        if(author==null){
            resp.getWriter().write("{ \"ok\": false, \"reason\": \"要查询的用户不存在!\" }");
            return;
        }

        // 把author返回到浏览器，注意清除密码
        author.setPassword("");
        resp.getWriter().write(objectMapper.writeValueAsString(author));
    }
}
